All 5 Parallel Routes & Intercepting Routes questions
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What are parallel routes in the Next.js App Router, and why would you use them? How do you set up the folder structure for a parallel route slot in your application? What is an intercepting route, and what problem does it solve? How would you combine parallel routes and intercepting routes together to build a modal that overlays the current page?
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Next.js › Parallel Routes & Intercepting Routes

What are common use cases where parallel routes provide a better solution than simply rendering multiple components inside a single page?

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Answer

Parallel routes shine when different sections of a page need independent loading and error states, independent data fetching, or need to support features like modals that intercept navigation, since a single page component would tie all of that logic together and make error or loading boundaries harder to isolate cleanly.
// Each parallel route slot can have its own
// loading.js and error.js files
// app/dashboard/@analytics/loading.js
// app/dashboard/@analytics/error.js
Real-world example A dashboard gives its analytics section its own independent error boundary, so if the analytics data fails to load, only that section shows an error message while the rest of the dashboard continues working normally.

Common follow-ups: Can different parallel route slots use entirely different data fetching strategies?;How do you decide between parallel routes and simply composing regular components?

Loading UI & Streaming with Suspense;Error Handling & Not Found Pages
All 5 Parallel Routes & Intercepting Routes questions